JEE Advanced 2013 Physics question
The work done on a particle of mass m by a force, (K being a constant of appropriate dimensions), when the particle is taken from the point (a, 0) to the point (0, a) along a circular path of radius a about the origin in the x-y plane is
Answer: (D)
Solution
The force is , a central force directed along the position vector. Along a circle centred at the origin the displacement is always tangential, i.e. perpendicular to $
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